Coins
The coins earned during the race are used to upgrading your cart (armor, stability, and evasion) and slingshot (faster draw, shoot more powerful projectiles, faster reload, and zoom in closer). You can gain coins during races by tapping on treasure chests. Meet the achievements listed at the main menu to earn coins.
General strategies
Although hitting anywhere when your reticule is red, you will do extra damage if you hit their eyes.
Because your kart moves automatically, concentrate on aiming and shooting your opponent with your slingshot. The winner is the first person to deplete the other racers health.
Other racers will become available after level Bosses are defeated. Each racer has a special skill (for example, Cuddles gains extra health healing kits are used and Giggles earns more money per race and treasure chest).
You will start the game with five free diamonds. Exchange them for coins at the bank and use them for kart and slingshot upgrades. It will be a slow process at first to earn coins through racing.